Freightliner Service Brake

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mrbamcclain, Jan 26, 2014.

Page 2 of 2
  1. Jan 26, 2014 #11
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    ok, one more time. Pedal swicth is used for ECM. Pressure switch is located in air switch manyfold, looks like biggest one, but it is ok, becouse brake light is OK
     
    Pablo-UA, Jan 26, 2014
    Pablo-UA, Jan 26, 2014
    #11
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  3. Jan 26, 2014 #12
    JohnP3

    JohnP3 Road Train Member

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    Feb 21, 2010
    Rock Creek B.C. Canada
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    There are two switches for the brakes in the manifold usually at the bottom on both sides, they are conected by one wire, and ground the system one is for the trailor one for the truck. Under the top dash pannel is the air switch that turns off the fast idle, when the trailor is loaded.
    Just a thought!
     
    JohnP3, Jan 26, 2014
    JohnP3, Jan 26, 2014
    #12
  4. Jan 29, 2014 #13
    mrbamcclain

    mrbamcclain Light Load Member

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    May 25, 2011
    Hammond, La
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    Figured it out....had an open pressure switch in a spot where it was supposed to be closed. That's the reason the cruise would work with the service brake in the down position, ecm was getting backward signals
     
    mrbamcclain, Jan 29, 2014
    mrbamcclain, Jan 29, 2014
    #13
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